Redesign homepage of an opencart template

Hello, I want to change the homepage design of my ecommerce website which is build using opencart. Currently we are using this theme - [login to view URL] Need to change the category button, and the design below the slider. There should be also a back panel from where we can edit the homepage category section. I have attached screenshot of the design, I want. Also need some modification on product page: 1) Add some information below every product title: When people click on why, it will pop up and show the information. 2) Show possible delivery date when the customer select shipping method. I will give you the timeframe, so this information should show on the website. 3) add facebook like and share button below the title of every product page. 4) add fb, google plus account login button at the top bar: